<template>
  <div>
      <p v-once>hello {{world}}</p>
      <button @click="world ='ziksang'">改变world</button>
  </div>
</template>
<script>
export default {
  name: "VOnce",
  data() {
    return {
      world: "vue"
    };
  }
};
</script>

